#ifndef __AUTH_H__
#define __AUTH_H__

#include <rpc/xdr.h>

/*
 * Status returned from authentication check
 */
enum auth_stat {
	AUTH_OK = 0,
	/*
	 * failed at remote end
	 */
	AUTH_BADCRED = 1,			/* bogus credentials (seal broken) */
	AUTH_REJECTEDCRED = 2,		/* client should begin new session */
	AUTH_BADVERF = 3,			/* bogus verifier (seal broken) */
	AUTH_REJECTEDVERF = 4,		/* verifier expired or was replayed */
	AUTH_TOOWEAK = 5,			/* rejected due to security reasons */
	/*
	 * failed locally
	*/
	AUTH_INVALIDRESP = 6,		/* bogus response verifier */
	AUTH_FAILED = 7			/* some unknown reason */
};

union des_block {
	struct {
		uint32_t high;
		uint32_t low;
	} key;
	char c[8];
};
typedef union des_block des_block;

/*
 * Authentication info.  Opaque to client.
 */
struct opaque_auth {
	enum_t	oa_flavor;		/* flavor of auth */
	char*	oa_base;		/* address of more auth stuff */
	unsigned int	oa_length;		/* not to exceed MAX_AUTH_BYTES */
};

/*
 * Auth handle, interface to client side authenticators.
 */
typedef struct AUTH AUTH;
struct AUTH {
	struct opaque_auth ah_cred;
	struct opaque_auth ah_verf;
	union des_block ah_key;
	struct auth_ops {
		void (*ah_nextverf)(AUTH*);
		int (*ah_marshal)(AUTH*, XDR*);		/* nextverf & serialize */
		int (*ah_validate)(AUTH*, struct opaque_auth*);
		/* validate verifier */
		int (*ah_refresh)(AUTH*);		/* refresh credentials */
		void (*ah_destroy)(AUTH*); 	    	/* destroy this structure */
	}* ah_ops;
	char* ah_private;
};

extern struct opaque_auth _null_auth;


/*
 * Authentication ops.
 * The ops and the auth handle provide the interface to the authenticators.
 *
 * AUTH	*auth;
 * XDR	*xdrs;
 * struct opaque_auth verf;
 */
#define AUTH_NEXTVERF(auth)		\
		((*((auth)->ah_ops->ah_nextverf))(auth))
#define auth_nextverf(auth)		\
		((*((auth)->ah_ops->ah_nextverf))(auth))

#define AUTH_MARSHALL(auth, xdrs)	\
		((*((auth)->ah_ops->ah_marshal))(auth, xdrs))
#define auth_marshall(auth, xdrs)	\
		((*((auth)->ah_ops->ah_marshal))(auth, xdrs))

#define AUTH_VALIDATE(auth, verfp)	\
		((*((auth)->ah_ops->ah_validate))((auth), verfp))
#define auth_validate(auth, verfp)	\
		((*((auth)->ah_ops->ah_validate))((auth), verfp))

#define AUTH_REFRESH(auth)		\
		((*((auth)->ah_ops->ah_refresh))(auth))
#define auth_refresh(auth)		\
		((*((auth)->ah_ops->ah_refresh))(auth))

#define AUTH_DESTROY(auth)		\
		((*((auth)->ah_ops->ah_destroy))(auth))
#define auth_destroy(auth)		\
		((*((auth)->ah_ops->ah_destroy))(auth))

#define MAX_AUTH_BYTES	400
#define MAXNETNAMELEN	255	/* maximum length of network user's name */

AUTH* authnone_create(void);

#endif
